Injection mold for optimizing filling structure based on plastic recovery ratio

Abstract

The invention relates to the technical field of recycled plastic injection molding equipment, and discloses an injection mold based on a plastic recycling proportion optimization filling structure, the injection mold comprises an operation box, the interior of the operation box is fixedly connected with a fixed mold plate, the fixed mold plate is slidably connected with a movable mold plate through a guide rod arranged on one side of the fixed mold plate, and the injection mold is used for injection molding. The injection mold for optimizing the filling structure based on the plastic recovery ratio can effectively solve the problems that in the prior art, recovered plastic materials are complex in component, come from different products in different fields and are different in melting point, water content, material quality and the like, traditional conveying equipment is difficult to sufficiently and uniformly stir different types of plastics, and the production efficiency is high. The problems that in the prior art, in order to guarantee the quality of produced and processed injection molding finished products, a large number of new plastic particles need to be added when recycled plastic is subjected to injection molding, so that the overall proportion of the recycled plastic is low, the production cost is high, and resource recycling is not facilitated are solved.

Description

Technical Field

[0001] The invention relates to the technical field of recycled plastic injection molding equipment, and in particular to an injection mold with an optimized filling structure based on a plastic recycling ratio. Background Art

[0002] Recycled plastic injection molding equipment is used to heat and melt recycled plastic and then inject it into a mold to form the desired plastic products. The core function of this equipment is to efficiently utilize waste plastic resources, reduce environmental pollution, and at the same time meet the high quality requirements of injection molding.

[0003] In the existing technology, the composition of recycled plastic materials is complex. They come from different products in different fields. The melting point, water content, material, etc. of recycled plastic materials are different. Traditional conveying equipment is difficult to fully mix different types of plastics. In order to ensure the quality of the production and processing of injection molded products, a large amount of new plastic particles need to be added when injecting recycled plastics, resulting in a low overall proportion of recycled plastics and high production costs, which is not conducive to the recycling of resources. Summary of the Invention

[0004] In response to the above-mentioned shortcomings of the prior art, the present invention provides an injection mold based on an optimized filling structure based on a plastic recycling ratio, which can effectively solve the problems in the prior art, such as the complex composition of recycled plastic materials, the melting point, water content, material, etc. of recycled plastic materials from different products in different fields are different, and traditional conveying equipment is difficult to fully mix different types of plastics. In order to ensure the quality of the production and processing of injection molded products, a large amount of new plastic particles need to be added when injecting the recycled plastics, resulting in a low overall proportion of recycled plastics, high production costs, and unfavorable for resource recycling.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] The present invention provides an injection mold with an optimized filling structure based on a plastic recycling ratio, comprising:

[0007] An operating box, wherein a fixed platen is fixedly connected to the interior of the operating box, and the fixed platen is slidably connected to a movable platen via a guide rod provided on one side thereof, for injection molding;

[0008] The injection unit includes a barrel fixed to the upper surface of the workbench. One end of the barrel is fixedly connected to a spherical seat. The barrel is connected to a screw rod through a drive seat located at the end of the barrel away from the spherical seat. The end of the screw rod away from the drive seat is threadedly connected to the screw. The end of the spherical seat away from the barrel is fixedly connected to the outer surface of the fixed plate. The interior of the spherical seat is provided with a glue head fixedly connected to the outer end of the screw rod. The interior of the spherical seat is provided with a stirring element for mixing the internal material.

[0009] Among them, the stirring element includes a center ring that is rotatably connected inside the spherical seat. The circumferential outer surface of the center ring adopts a spherical surface design that fits the circumferential inner wall of the spherical seat. The inner wall surface of the center ring is fixedly connected with an oblique bar, and the oblique bar is provided with multiple and evenly distributed around the circumference of the screw as the center. The circumferential outer surface of the glue head is provided with an oblique groove that fits the outer surface of the oblique bar.

[0010] Furthermore, the outer circumferential surface of the screw is sleeved with a check ring that fits with the side of the glue head close to the screw rod, and the side of the check ring away from the glue head is provided with an eccentric washer that fits with the outer circumferential surface of the screw.

[0011] Furthermore, a limiting ring that fits with the outer circumferential surface of the check ring is fixedly connected to the side of the glue-passing head close to the eccentric washer.

[0012] Furthermore, an annular conical surface that fits with the outer surface of the check ring is provided on the side of the eccentric washer close to the glue head, and the central axis of the annular conical surface coincides with the central axis of the screw.

[0013] Furthermore, the outer circumferential surface of the eccentric washer adopts an arc surface design that fits the inner wall surface of the spherical seat.

[0014] Furthermore, an exhaust hole is provided at the top end of the outer circumferential surface of the spherical seat, and a connecting hole communicating with the interior of the exhaust hole is provided inside the center ring.

[0015] Furthermore, a positioning pin connected to the circumferential inner wall of the eccentric washer is provided on the circumferential outer surface of the screw.

[0016] Furthermore, the outer circumferential surfaces of the barrel and the spherical seat are both covered with heating sleeves, and the interior of the connecting hole adopts an inclined design.

[0017] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0018] The present invention comprises a spherical seat, a gluing head, and a stirring element. A center ring engages with the inner wall of a slanted groove on the outer surface of the gluing head via a beveled rod fixed to its inner surface. During the loading process, the gluing head rotates synchronously with the screw, driving the center ring and the beveled rod inside the spherical seat to rotate. After the beveled rod is inserted into the plastic material, it exerts a thrust on the plastic material. Because the beveled rod has a certain tilt angle, this thrust has components not only along the circumference of the center ring but also along the radial and axial directions of the barrel. The stirring element promotes the flow of the plastic material throughout the interior space of the spherical seat. Plastic materials at different positions exchange positions under the action of the beveled rod, pushing plastic materials originally at the bottom to the top and plastic materials originally near the edge to the center, thereby achieving the flipping of the molten plastic material inside the spherical seat. This flipping process ensures that the materials are fully mixed, helps eliminate possible temperature differences and compositional inhomogeneities in the materials, improves the quality uniformity of the plastic materials, and provides good material conditions for subsequent injection molding. The stirring element can make recycled plastics from different sources evenly distributed at the microscopic level, so that they exhibit relatively consistent physical and chemical properties at the macroscopic level, which is conducive to subsequent processing and molding, so that recycled plastics can better replace new plastics, thereby increasing the proportion of recycled plastics in the entire plastic material. The amount of new plastic particles required to be added is reduced, which helps to reduce production costs, realize the recycling of resources, and thus alleviate the pressure of resource shortages. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0020] Figure 1 It is a three-dimensional structural diagram of an embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the cross-sectional structure of the barrel and the spherical seat according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the separation structure of the injection part according to an embodiment of the present invention;

[0023] Figure 4 Schematic diagram of the cross-sectional structure of the center ring, the gluing head and the screw in an embodiment of the present invention;

[0024] Figure 5 This is a schematic structural diagram of the screw, stirring element and laminating head according to an embodiment of the present invention;

[0025] Figure 6Schematic diagram of the state changes of the glue head, the check ring and the eccentric washer in an embodiment of the present invention;

[0026] Figure 7 Schematic diagram of the cross-sectional structure of the spherical seat, center ring and glue head according to an embodiment of the present invention;

[0027] Figure 8 Schematic diagram of the three-dimensional structure of the eccentric washer according to an embodiment of the present invention.

[0028] The numbers in the figure represent: 1. operating box; 11. fixed template; 12. guide rod; 13. movable template; 2. injection part; 21. barrel; 211. heating sleeve; 22. spherical seat; 221. exhaust hole; 222. connecting hole; 23. screw rod; 24. screw; 241. glue head; 2411. limiting ring; 242. check ring; 243. eccentric washer; 2431. annular cone; 25. stirring element; 251. center ring; 252. oblique bar; 253. inclined groove. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] The present invention will be further described below with reference to the embodiments.

[0031] Example:

[0032] See also Figures 1-8 The present invention provides a technical solution: an injection mold with an optimized filling structure based on a plastic recycling ratio, comprising:

[0033] An operation box 1, wherein a fixed platen 11 is fixedly connected to the interior of the operation box 1, and the fixed platen 11 is slidably connected to a movable platen 13 via a guide rod 12 provided on one side thereof, for injection molding;

[0034] The injection unit 2 includes a barrel 21 fixed to the upper surface of the workbench. One end of the barrel 21 is fixedly connected to a spherical seat 22. The barrel 21 is internally connected to a screw rod 23 through a drive seat located at the end of the barrel 21 away from the spherical seat 22. The end of the screw rod 23 away from the drive seat is threadedly connected to a screw rod 24. The end of the spherical seat 22 away from the barrel 21 is fixedly connected to the outer surface of the fixed mold plate 11. The interior of the spherical seat 22 is provided with a glue head 241 fixedly connected to the outer end of the screw rod 24. The interior of the spherical seat 22 is provided with a stirring element 25 for mixing the internal material.

[0035] Among them, the stirring member 25 includes a center ring 251 that is rotatably connected inside the spherical seat 22. The outer surface of the center ring 251 adopts a spherical surface design that fits the inner wall of the circumference of the spherical seat 22. The inner wall surface of the center ring 251 is fixedly connected with an inclined bar 252, and the inclined bar 252 is provided with multiple and evenly distributed around the circumference of the screw 24 as the center. The outer surface of the circumference of the glue head 241 is provided with an inclined groove 253 that fits the outer surface of the inclined bar 252. The inclined bar 252 is an arc-shaped bar that fits the inner wall of the center ring 251. The inclination degree of the inclined bar 252 can be adjusted according to the specific material.

[0036] The outer circumferential surface of the screw 24 is sleeved with a check ring 242 that fits with the side of the glue head 241 close to the screw rod 23, and the side of the check ring 242 away from the glue head 241 is provided with an eccentric washer 243 that fits with the outer circumferential surface of the screw 24.

[0037] A limiting ring 2411 that fits the outer circumference of the check ring 242 is fixedly connected to one side of the glue head 241 close to the eccentric washer 243 .

[0038] The side of the eccentric washer 243 near the rubber head 241 is provided with an annular conical surface 2431 that mates with the outer surface of the check ring 242. The central axis of this annular conical surface 2431 coincides with the central axis of the screw 24. The inner circumferential surface of the stop ring 2411 is in constant contact with the outer circumferential surface of the check ring 242, ensuring that the central axis of the check ring 242 always aligns with the central axis of the screw 24. During the subsequent injection molding process, the conical surface of the check ring 242 near the drive seat always aligns with the annular conical surface 2431. Although the center of the eccentric washer 243 does not coincide with the axis of the screw 24, the center of the annular conical surface 2431 always aligns with the central axis of the screw 24. The width of the annular conical surface 2431 varies at different locations. Even at its smallest width, it still mates with the outer surface of the check ring 242, ensuring a tight seal during the injection molding process.

[0039] The outer circumferential surface of the eccentric washer 243 is designed to be in a curved surface that fits the inner wall surface of the spherical seat 22 , and can apply stirring force and extrusion force to the plastic material entering the spherical seat 22 from the barrel 21 .

[0040] An exhaust hole 221 is formed at the top of the outer circumferential surface of the spherical seat 22 , and a connecting hole 222 communicating with the interior of the exhaust hole 221 is formed inside the center ring 251 .

[0041] The outer circumferential surface of the screw rod 24 is provided with a positioning pin connected to the inner circumferential wall of the eccentric washer 243 .

[0042] The outer circumferential surfaces of the barrel 21 and the spherical seat 22 are both covered with a heating sleeve 211 , and the interior of the connecting hole 222 is designed to be inclined.

[0043] In actual use, the barrel 21 in the injection unit 2 is fixed above the workbench. The barrel 21 and the spherical seat 22 are fixedly connected by a flange. A nozzle is provided on the side of the spherical seat 22 away from the barrel 21. The nozzle extends into the interior of the fixed plate 11 and is connected to the mold cavity inside the fixed plate 11. A hopper is fixedly connected to the upper side of the barrel 21 away from the fixed plate 11. Pre-treated plastic particles are passed from the hopper into the barrel 21. The interior of the drive seat is in transmission connection with the screw rod 23. The drive seat drives the screw rod 23 to rotate clockwise inside the barrel 21, driving the plastic particles inside the barrel 21 toward the fixed plate 11.

[0044] The screw rod 23 includes a rotating rod and blades. The diameter of the rotating rod adopts a gradual design. The smallest end of the rotating rod diameter of the screw rod 23 is close to the side of the drive seat, and the largest end of the rotating rod diameter of the screw rod 23 is close to the side of the fixed mold plate 11. The closer the rotating rod of the screw rod 23 is to the fixed mold plate 11, the larger its diameter. When the screw rod 23 rotates, the plastic particles inside it continuously move toward the side of the fixed mold plate 11. As the moving distance increases, the plastic particles gradually reach the position of the heating sleeve 211. As the temperature rises, the plastic particles begin to plasticize. The closer they get to the fixed mold plate 11, the distance between the outer surface of the rotating rod in the screw rod 23 and the circumferential inner surface of the barrel 21 gradually decreases, the space occupied by the plastic decreases, and the internal plastic material gradually approaches the circumferential inner wall surface of the barrel 21. The temperature it is subjected to also gradually increases, and it gradually changes into a molten plastic liquid.

[0045] As screw 23 continues to rotate, the plastic material moves toward the interior of spherical seat 22. Eccentric washer 243 utilizes an eccentric design. The central axis of annular cone 2431 coincides with the central axis of screw 24, while the center of eccentric washer 243 is offset from the central axis of screw 24. A locating pin secures eccentric washer 243 relative to screw 24. Clockwise rotation of screw 23 tightens the connection. Eccentric washer 243 and screw 24 rotate synchronously clockwise under the action of screw 23.

[0046] In its initial state, the eccentric washer 243 is tangent to a certain point on the inner wall of the spherical seat 22. The outer surface of the eccentric washer 243, located away from this point, is at its greatest distance from the circumferential inner wall of the spherical seat 22. Due to the eccentric nature of the eccentric washer 243, its outer surface continually contacts different locations on the inner wall of the spherical seat 22. As the eccentric washer 243 continues to rotate, the contact points between the eccentric washer 243 and the inner wall of the spherical seat 22 also continuously change along the inner wall surface. The eccentric washer 243 generates contact pressure at different locations on the inner wall of the spherical seat 22. This pressure distribution is uneven and continuously changes as the eccentric washer 243 rotates. During the process of the eccentric washer 243 rotating one circle, it will contact various parts of the inner wall of the spherical seat 22 at that position in turn. The degree of contact and pressure will be different at the same time. At the position where the distance between the outer surface of the eccentric washer 243 and the inner wall of the spherical seat 22 is the smallest, the contact is relatively close and the pressure is relatively high; at other positions, the contact is loose (the distance between the eccentric washer 243 and the spherical seat 22 is farther) and the pressure is small.

[0047] This constantly changing contact state pushes, squeezes, and stirs the plastic material entering the spherical seat 22 from the barrel 21. This helps break down the layers between plastic materials from complex sources. Recycled plastics from complex sources are prone to uneven mixing due to differences in type, density, and shape. The eccentric washer 243 continuously tumbles the plastic material flowing from the barrel 21 into the spherical seat 22. This uneven force creates a complex flow and tumbling within the spherical seat 22, allowing recycled plastics from different locations and types to be thoroughly mixed. On the other hand, when the eccentric washer 243 contacts the inner wall of the spherical seat 22, a large pressure and shear force will be generated near the contact point, which helps to break up the plastic material that is still in a solid state (plastic particles that are not completely plasticized due to large particle size, plastic particles that are not completely plasticized due to high melting point, plastic particles that are not completely plasticized due to insufficient stirring and are always away from the inner wall of the barrel 21, etc.), thereby increasing the specific surface area of the solid plastic particles, thereby improving the heat transfer efficiency, allowing the plastic material to absorb heat more quickly and evenly, and achieving a better plasticizing effect.

[0048] Recycled plastics have different sources and characteristics, and some may be difficult to plasticize. The eccentric washer 243 with an eccentric structure generates pressure and shear force, which can reduce product quality problems caused by insufficient plasticization, such as surface defects and insufficient strength. At the same time, it can also improve production efficiency and reduce plasticization time and energy consumption.

[0049] During feeding, the check ring 242 is pushed by the material, and its side close to the fixed template 11 fits against the inner wall of the glue head 241. There is a certain gap between the conical surface on the other side of the check ring 242 and the annular conical surface 2431 on the outer surface of the eccentric washer 243. After passing through the eccentric washer 243, the plastic material follows this gap into the cavity surrounded by the check ring 242 and the screw 24, and is melted and mixed again, and finally enters the spherical seat 22 through the through hole opened inside the glue head 241.

[0050] Under the action of gravity, the plastic material flows onto the inner wall of center ring 251. The outer surface of center ring 251 adopts a spherical design that mates with the inner wall of spherical seat 22. The interior of center ring 251 adopts a cylindrical cavity that mates with the outer surface of gluing head 241. Gluing head 241 and retaining ring 2411 are designed as an integrated whole. Beveled groove 253 acts on the outer circumference of gluing head 241 and retaining ring 2411. The inner wall of beveled groove 253 always mates with the outer surface of inclined rod 252. The outer surface of inclined rod 252 and the inner wall of beveled groove 253 are both relatively smooth. There is a one-to-one correspondence between beveled grooves 253 and inclined rod 252. Multiple beveled grooves 253 are provided, distributed in an array around the screw 24. The center ring 251 rotates synchronously around the inner wall of the spherical seat 22 with the cooperation of the oblique bars 252 and the oblique grooves 253 , following the glue head 241 . The multiple raised oblique bars 252 evenly distributed on the inner wall surface of the center ring 251 flip the molten plastic material inside the spherical seat 22 .

[0051] The molten plastic flows outside the bottom slanted bars 252. As the center ring 251 rotates, the slanted bars 252 gradually penetrate the molten plastic. At the same time, slanted bars 252 at different positions penetrate the material from different directions, like multiple paddles simultaneously acting on a liquid. Once the slanted bars 252 enter the plastic material, they exert a thrust. Because the slanted bars 252 are tilted at a certain angle, this thrust has components not only along the circumference of the center ring 251 but also along the radial and axial directions of the barrel 21. The thrust in the circumferential direction will cause the plastic material to flow along the rotation direction of the center ring 251, forming a circular flow in the circumferential direction; the thrust in the radial direction will cause the plastic material to move in the radial direction of the spherical seat 22, pushing the material from the central area to the edge, or pulling it from the edge area to the center; the thrust in the axial direction will cause the plastic material to move in the axial direction of the spherical seat 22. When the plastic material falls downward under the action of gravity before reaching the top, it is affected by the inclined inclined bars 252 and collides with the protruding outer surface of the glue head 241. At this time, the glue head 241 is also in a rotating state, and the plastic material is subjected to shear force and impact force, which further promotes the mixing and homogenization of the plastic material, and also helps to further disperse and refine the lumps or incompletely melted parts in the plastic material.

[0052] Therefore, the stirring member 25 promotes the flow of the plastic material throughout the interior space of the spherical seat 22. Different plastic materials exchange positions within the center ring 251 under the action of the rotating oblique bars 252. Plastic materials originally at the bottom are pushed upward, and plastic materials originally near the edge are pulled to the center, thereby achieving the tumbling of the molten plastic material within the spherical seat 22. This tumbling process ensures that the materials are thoroughly mixed, helps eliminate possible temperature differences and uneven composition within the materials, improves the quality uniformity of the plastic materials, and provides good material conditions for subsequent injection molding.

[0053] Waste plastics will absorb a certain amount of moisture during the recycling and storage process. When they are subjected to the high temperature of the heating sleeve 211, the moisture will evaporate to form water vapor. Waste plastics will come into contact with various solvents during packaging or processing. These residual solvents will evaporate into gases under the high temperature of plasticization. Gases gather in the plastic melt. If these gases cannot be discharged in time, they will form pores inside the product or bubbles on the surface, seriously affecting the surface finish and aesthetics of the injection molded product and reducing the product's pass rate. Gases occupy a certain space in the mold cavity, which will hinder the normal flow of the plastic melt, resulting in the plastic material melt being unable to completely fill the mold cavity, resulting in the phenomenon of insufficient mold filling, making the product short of material and incomplete, increasing the scrap rate, and the presence of pores and bubbles causes defects to form inside the product, resulting in a significant reduction in the mechanical properties of the product, such as strength and toughness.

[0054] An exhaust hole 221 is provided at the highest point of the outer surface of the spherical seat 22, and a connecting hole 222 is provided inside the center ring 251 in the same vertical plane that coincides with the exhaust hole 221. The connecting hole 222 is designed to be inclined. There are multiple connecting holes 222 evenly distributed around the circumference. When the top of one of the connecting holes 222 fits with the bottom of the exhaust hole 221, the inside and outside of the spherical seat 22 are connected, and the gas generated during the plasticizing process can be discharged in time to avoid a large amount of gas from accumulating inside the spherical seat 22, thereby reducing the possibility of defects such as pores and bubbles in the product and improving the quality of the injection molded product. Compared with a single vertical hole, the inclined hole is not easily clogged by plastic. Even if it enters the connecting hole 222, during the clockwise rotation of the center ring 251 (such as Figure 7 As shown, before connecting hole 222 reaches its highest point, it is already tilted downward, and the plastic material inside flows out of connecting hole 222 due to gravity, thereby ensuring smooth exhaust passage when exhaust hole 221 is connected to the interior of connecting hole 222. Each time center ring 251 rotates a certain angle, connecting hole 222 can be connected to exhaust hole 221 again.

[0055] Injection molding process:

[0056] After loading is completed, the screw 23 stops rotating, and the plasticized material is distributed in the lower half of the spherical seat 22 due to gravity. Under the action of the drive seat, the screw 23 as a whole moves toward the fixed plate 11. The screw 24, the glue head 241, the check ring 242, and the eccentric washer 243 connected to the screw 23 by threads move synchronously. During movement, the check ring 242 is affected by the internal pressure of the spherical seat 22 and the reverse push of the plastic material, and moves on the outer surface of the screw 24 toward the eccentric washer 243. At this time, the outer conical surface of the screw 24 is tightly fitted with the annular conical surface 2431 on the outer surface of the eccentric washer 243, preventing the reverse flow of the plastic material. The gluing head 241 is stopped by the screw 24 and moves toward the fixed mold plate 11 while maintaining this state. During the movement of the gluing head 241, the inclined bars 252, which are in contact with the inner wall of the inclined groove 253, are pushed, causing the center ring 251 to rotate in contact with the inner wall of the spherical seat 22 during the movement of the gluing head 241. Because the injection molding stage requires a certain amount of pressure and a relatively fast pushing speed, the plastic material distributed in the lower half of the spherical seat 22 due to gravity is also affected by the inclined bars 252, causing it to be rapidly swung inside the center ring 251. This promotes uniform distribution of the plastic material in the radial range during injection, reduces injection resistance, helps ensure pressure uniformity during injection, and ensures the stability of the injection process and product quality.

[0057] As the gluing head 241 gradually moves toward the fixed platen 11, the plasticized plastic inside the spherical seat 22 is gradually injected through the nozzle into the cavity between the fixed platen 11 and the movable platen 13 until it is completely injected. The screw rod 23 remains in this state, maintaining pressure on the injection molded product in the cavity. The injection molded product follows the coolant inside the mold to remove heat. After molding is completed, the demolding mechanism inside the operating box 1 slides the movable platen 13 horizontally on the outer surface of the guide rod 12, moving it away from the fixed platen 11. The molded injection molded product is ejected by the internal ejection structure, completing the unloading. At this point, a complete plastic process is completed. The screw rod 23 is then moved backward through the drive seat, and the above actions are repeated to repeat the loading and injection molding.

[0058] In summary, the injection molding equipment has the following advantages:

[0059] Advantage 1: The interior of the spherical seat 22 is provided with a center ring 251. The center ring 251 engages with the inner wall of the inclined groove 253 on the outer surface of the gluing head 241 via an inclined rod 252 fixed to its inner surface. During the loading process, the gluing head 241 rotates synchronously with the screw 23, driving the center ring 251 and the inclined rod 252 inside the spherical seat 22 to rotate. When the inclined rod 252 rotates against the plastic material, it exerts a thrust on the plastic material. Because the inclined rod 252 has a certain inclination angle, this thrust has a component not only along the circumference of the center ring 251 but also along the radial and axial directions of the barrel 21. The stirring element 25 promotes the flow of the plastic material throughout the interior space of the spherical seat 22. Plastic materials at different positions exchange positions with each other under the action of the inclined rod 252. Plastic material originally at the bottom is pushed upward, and plastic material originally near the edge is pulled to the center, thereby achieving the turnover of the molten plastic material inside the spherical seat 22. This flipping process allows the materials to be fully mixed, helps to eliminate the temperature differences and uneven composition problems that may exist in the materials, improves the quality uniformity of the plastic materials, and provides good material conditions for subsequent injection molding. Since the stirring member 25 can fully mix plastic materials with complex sources, it can make the recycled plastics from different sources evenly distributed at the micro level, thereby showing more consistent physical and chemical properties at the macro level, which is conducive to subsequent processing and molding, so that the recycled plastics can better replace new plastics, thereby increasing the proportion of recycled plastics in the entire plastic material. The required amount of new plastic particles to be added is reduced, which helps to reduce production costs, realize the recycling of resources, and thus alleviate the pressure of resource shortages.

[0060] Advantage 2: After the loading is completed, the screw rod 23 stops rotating, and the plasticized material tends to be distributed in the lower half of the spherical seat 22 due to the action of gravity. The angle of the glue head 241 is fixed when it moves and it does not rotate. The glue head 241 and the center ring 251 move relative to each other, driving the center ring 251 and the oblique rod 252 to fit and rotate with the inner wall of the spherical seat 22, which can swing the plastic material distributed in the lower half of the spherical seat 22 due to the action of gravity, promote the uniform distribution of the plastic material during injection, reduce the injection resistance, help to ensure the uniformity of the pressure during injection, and ensure the stability of the injection process and the quality of the product.

[0061] Advantage 3: When the top end of the connecting hole 222 fits with the bottom end of the exhaust hole 221, the inside and outside of the spherical seat 22 are connected, and the gas generated during the plasticizing process can be discharged in time, avoiding a large amount of gas from accumulating inside the spherical seat 22, thereby reducing the possibility of defects such as pores and bubbles in the product and improving the quality of the injection molded product.

[0062] Advantage 4: The outer surface of the eccentric washer 243 constantly contacts different locations on the inner wall of the spherical seat 22. This constantly changing contact state pushes, squeezes, and stirs the plastic material entering the spherical seat 22 from the barrel 21. On the one hand, this breaks down the stratification of plastic materials from complex sources: the materials flow and tumble within the spherical seat 22, allowing for thorough mixing of recycled plastics from different locations and types. On the other hand, when the eccentric washer 243 contacts the inner wall of the spherical seat 22, it generates significant pressure and shear forces near the contact point, helping to break up plastic materials that are still in a solid state (such as plastic particles that are not fully plasticized due to their large particle size, plastic particles that are not fully plasticized due to their high melting point, or plastic particles that are not fully plasticized due to insufficient stirring and remain away from the inner wall of the barrel 21). This increases the specific surface area of the solid plastic particles, thereby improving heat transfer efficiency and allowing the plastic material to absorb heat more quickly and evenly, achieving a better plasticization effect.

[0063] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An injection mold with an optimized filling structure based on plastic recycling ratio, characterized in that: include: An operating box (1), wherein a fixed platen (11) is fixedly connected to the interior of the operating box (1), and the fixed platen (11) is slidably connected to a movable platen (13) via a guide rod (12) provided on one side thereof, for injection molding; An injection part (2), the injection part (2) comprising a barrel (21) fixed on the upper surface of a workbench, one end of the barrel (21) being fixedly connected to a spherical seat (22), the barrel (21) being internally connected to a screw rod (23) through a drive seat arranged at an end thereof away from the spherical seat (22), the end of the screw rod (23) away from the drive seat being threadedly connected to a screw rod (24), the end of the spherical seat (22) away from the barrel (21) being fixedly connected to the outer surface of a fixed template (11), the interior of the spherical seat (22) being provided with a glue head (241) fixedly connected to the outer end of the screw rod (24), the interior of the spherical seat (22) being provided with a stirring member (25) for mixing the internal material; The stirring member (25) includes a center ring (251) rotatably connected inside the spherical seat (22), the circumferential outer surface of the center ring (251) is designed as a spherical surface that fits the circumferential inner wall of the spherical seat (22), the inner wall surface of the center ring (251) is fixedly connected with an oblique bar (252), and the oblique bar (252) is provided with a plurality of them and is evenly distributed around the circumference of the screw (24), and the circumferential outer surface of the glue head (241) is provided with an oblique groove (253) that fits the outer surface of the oblique bar (252).

2. The injection mold with an optimized filling structure based on plastic recycling ratio according to claim 1, characterized in that: The outer circumferential surface of the screw rod (24) is sleeved with a check ring (242) that fits with the side of the glue head (241) close to the screw rod (23), and the side of the check ring (242) away from the glue head (241) is provided with an eccentric washer (243) that fits with the outer circumferential surface of the screw rod (24).

3. The injection mold with an optimized filling structure based on plastic recycling ratio according to claim 2, characterized in that: A limiting ring (2411) that fits the outer circumferential surface of the check ring (242) is fixedly connected to one side of the glue head (241) close to the eccentric washer (243).

4. The injection mold with an optimized filling structure based on plastic recycling ratio according to claim 3, characterized in that: The eccentric washer (243) is provided with an annular conical surface (2431) that fits the outer surface of the check ring (242) on one side close to the rubber head (241), and the central axis of the annular conical surface (2431) coincides with the central axis of the screw (24).

5. The injection mold with an optimized filling structure based on plastic recycling ratio according to claim 4, characterized in that: The circumferential outer surface of the eccentric washer (243) is designed to be in a curved surface that fits the inner wall surface of the spherical seat (22).

6. The injection mold with an optimized filling structure based on plastic recycling ratio according to claim 5, characterized in that: An exhaust hole (221) is provided at the top end of the outer circumferential surface of the spherical seat (22), and a connecting hole (222) communicating with the interior of the exhaust hole (221) is provided inside the center ring (251).

7. The injection mold with an optimized filling structure based on plastic recycling ratio according to claim 5, characterized in that: The outer circumferential surface of the screw rod (24) is provided with a positioning pin connected to the inner circumferential wall of the eccentric washer (243).

8. The injection mold with an optimized filling structure based on plastic recycling ratio according to claim 6, characterized in that: The outer circumferential surfaces of the barrel (21) and the spherical seat (22) are both covered with a heating sleeve (211), and the interior of the connecting hole (222) is designed to be inclined.

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